diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c5f0135..c445a445 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -47,6 +47,8 @@
   itself, and fcft has been compiled with support for it.
 * Default value of `[tweak].grapheme-width-method` changed from
   `double-width` to `wcswidth`.
+* INSTALL.md: `--override tweak.grapheme-shaping=no` added to PGO
+  command line.
 
 
 ### Deprecated
diff --git a/INSTALL.md b/INSTALL.md
index d1801b1b..53619f9e 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -398,7 +398,11 @@ We will use the script `scripts/generate-alt-random-writes.py`:
 ```sh
 ./footclient --version
 foot_tmp_file=$(mktemp)
-./foot --config=/dev/null --term=xterm sh -c "<path-to-generate-alt-random-writes.py> --scroll --scroll-region --colors-regular --colors-bright --colors-256 --colors-rgb --attr-bold --attr-italic --attr-underline --sixel ${foot_tmp_file} && cat ${foot_tmp_file}"
+./foot \
+    --config=/dev/null \
+    --override tweak.grapheme-shaping=no \
+    --term=xterm \
+    sh -c "<path-to-generate-alt-random-writes.py> --scroll --scroll-region --colors-regular --colors-bright --colors-256 --colors-rgb --attr-bold --attr-italic --attr-underline --sixel ${foot_tmp_file} && cat ${foot_tmp_file}"
 rm ${foot_tmp_file}
 ```
 
diff --git a/pgo/full-inner.sh b/pgo/full-inner.sh
index e6168081..599d6aad 100755
--- a/pgo/full-inner.sh
+++ b/pgo/full-inner.sh
@@ -18,6 +18,7 @@ cd "${blddir}"
 "${blddir}"/footclient --version
 "${blddir}"/foot \
            --config=/dev/null \
+           --override tweak.grapheme-shaping=no \
            --term=xterm \
         sh -c "
           set -eux