diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 8dbc662..215d497 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -78,11 +78,13 @@ jobs:
   build:
     name: build and package ${{ matrix.arch }}
     needs: gate
-    # ⛔ BOTH architectures build on ubuntu-latest, and that is deliberate.
-    # scripts/build.sh CROSS-compiles aarch64 inside the x86-64 floor image.
-    # `podman run --platform linux/arm64` would pull a tag for another
-    # platform, REPLACE the cached image for that tag, and leave the next
-    # x86-64 job with "Exec format error". docs/building.md says what it cost.
+    # ⛔ ALL SIX architectures build on ubuntu-latest, and that is deliberate.
+    # scripts/build.sh CROSS-compiles every non-x86-64 target inside the x86-64
+    # floor image. `podman run --platform linux/arm64` would pull a tag for
+    # another platform, REPLACE the cached image for that tag, and leave the
+    # next x86-64 job with "Exec format error". docs/building.md says what it
+    # cost. The matrix below is the same six the gates build, so a release can
+    # never silently lag what the default branch already proved.
     runs-on: ubuntu-latest
     timeout-minutes: 30
     # ⭐ Two variants, so nobody has to build one by hand. `default` reads
@@ -93,7 +95,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        arch: [x86_64, aarch64]
+        arch: [x86_64, aarch64, riscv64, ppc64, ppc64le, loongarch64]
         variant: [default, portable]
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
@@ -177,15 +179,14 @@ jobs:
           path: staged
 
       # download-artifact writes one directory per uploaded artifact, so the
-      # two architectures arrive as staged/release-x86_64/... and
-      # staged/release-aarch64/.... Flatten them into the layout the two
-      # scripts expect, and fail if either is missing rather than publishing
-      # half a release.
+      # six architectures arrive as staged/release-<arch>/... Flatten them into
+      # the layout the two scripts expect, and fail if any is missing rather
+      # than publishing half a release.
       - name: collect every architecture and variant
         run: |
           set -eu
           mkdir -p dist build
-          for a in x86_64 aarch64; do
+          for a in x86_64 aarch64 riscv64 ppc64 ppc64le loongarch64; do
             for v in default portable; do
               src=staged/release-$a-$v
               [ -d "$src/dist" ] || { echo "no dist/ for $a/$v"; exit 1; }
@@ -210,7 +211,7 @@ jobs:
           # ⚠ Only the DEFAULT variant ships loose files to check this way.
           # The portable set ships as archives, and package-release.sh already
           # checked every object in it against its manifest before archiving.
-          for a in x86_64 aarch64; do
+          for a in x86_64 aarch64 riscv64 ppc64 ppc64le loongarch64; do
             man=build/$a/build-manifest.json
             for f in $(jq -r '.artifacts | keys[]' "$man"); do
               want=$(jq -r --arg f "$f" '.artifacts[$f].sha256' "$man")
diff --git a/scripts/release-notes.sh b/scripts/release-notes.sh
index c000513..4b5e963 100644
--- a/scripts/release-notes.sh
+++ b/scripts/release-notes.sh
@@ -41,28 +41,65 @@ for d in "$BUILDS"/*; do
 done
 [ -n "$dirs" ] || { echo "release-notes: no build-manifest.json under $BUILDS" >&2; exit 2; }
 
-# The floor is a property of the build environment and every build here uses
-# the same one. If two manifests disagree, that is a finding and not something
-# to paper over with the first value.
-floor=""
+# The floor is a property of the build environment. Every build here uses the
+# same one, except loongarch64, whose floor is 2.36 because that is the first
+# glibc release that runs loongarch64 at all (docs/building.md). The header
+# below must not assert a single value across two floors, and the two variants
+# of one architecture must still agree: they are the same build in the same
+# environment, and a disagreement there is a finding rather than a value to
+# print past.
+floorlist=""
 for d in $dirs; do
-	f=$(jq -r '.floor_glibc' "$BUILDS/$d/build-manifest.json")
-	if [ -z "$floor" ]; then floor=$f
-	elif [ "$floor" != "$f" ]; then
-		echo "release-notes: manifests disagree about the floor: $floor and $f" >&2
+	m=$BUILDS/$d/build-manifest.json
+	floorlist="$floorlist $(jq -r '.arch' "$m"):$(jq -r '.floor_glibc' "$m")"
+done
+
+# ⛔ One architecture, one floor. If the default and portable manifests of the
+# same architecture disagree, refuse rather than printing a body that cannot
+# be true.
+for a in $(printf '%s\n' "$floorlist" | tr ' ' '\n' | sed '/^$/d;s/:.*//' | sort -u); do
+	n=$(printf '%s\n' "$floorlist" | tr ' ' '\n' |
+	    grep "^$a:" | sed 's/.*://' | sort -u | grep -c .)
+	[ "$n" -le 1 ] || {
+		echo "release-notes: $a has $n floors in its manifests" >&2
 		exit 2
-	fi
+	}
 done
 
+nfloors=$(printf '%s\n' "$floorlist" | tr ' ' '\n' | sed '/^$/d;s/.*://' | sort -u | grep -c .)
+if [ "$nfloors" -le 1 ]; then
+	floor=$(printf '%s\n' "$floorlist" | tr ' ' '\n' | sed '/^$/d;s/.*://' | sort -u)
+fi
+
 printf '## cross-libc `dlopen` %s\n\n' "$TAG"
 printf 'Load the host'"'"'s GPU drivers into a process that carries its own libc.\n'
 printf 'See the [README](https://github.com/pkgforge-dev/cross-libc-dlopen#readme)\n'
 printf 'for what the two gaps are and which one your symptom is.\n\n'
 
-printf '**Built on glibc %s**, which is the floor every artefact here is held\n' "$floor"
-printf 'to. An object needing a symbol version above it would fail to load inside\n'
-printf 'a bundle whose glibc is older, so the build refuses to produce one and\n'
-printf 'the packaging step refuses to publish one.\n\n'
+if [ "$nfloors" -le 1 ]; then
+	printf '**Built on glibc %s**, which is the floor every artefact here is held\n' "$floor"
+	printf 'to. An object needing a symbol version above it would fail to load inside\n'
+	printf 'a bundle whose glibc is older, so the build refuses to produce one and\n'
+	printf 'the packaging step refuses to publish one.\n\n'
+else
+	# ⛔ The floors come out of the manifests, not out of this text: loongarch64
+	# is built on 2.36 because that is the first glibc that runs it at all, and
+	# the rest on 2.31. Spelled here, a floor change would silently leave the
+	# body claiming a number the builds no longer used.
+	printf '**Built on the glibc floor for each architecture.** '
+	first_floor=1
+	for f in $(printf '%s\n' "$floorlist" | tr ' ' '\n' | sed '/^$/d;s/.*://' | sort -uV); do
+		arches=$(printf '%s\n' "$floorlist" | tr ' ' '\n' |
+			grep ":$f$" | sed 's/:.*//' | sort -u | tr '\n' ' ' | sed 's/ $//')
+		if [ "$first_floor" = 1 ]; then first_floor=0
+		else printf '; '
+		fi
+		printf '%s are held to glibc %s' "$arches" "$f"
+	done
+	printf '. An object needing a symbol version above its floor would fail to\n'
+	printf 'load inside a bundle whose glibc is older, so the build refuses to\n'
+	printf 'produce one and the packaging step refuses to publish one.\n\n'
+fi
 
 # ------------------------------------------------------------- the changelog --
 printf '### Changes\n\n'