diff --git a/SC2181.md b/SC2181.md
index 00d1e3b..2aa491c 100644
--- a/SC2181.md
+++ b/SC2181.md
@@ -14,11 +14,21 @@ fi
 ### Correct code:
 
 ```sh
-if ! make mytarget;
+if ! make mytarget
 then
   echo "Build failed"
 fi
 ```
+For the Solaris 10 Bourne shell:
+```sh
+if make mytarget
+then
+  :
+else
+  echo "Build failed"
+fi
+```
+
 ### Rationale:
 
 Running a command and then checking its exit status `$?` against 0 is redundant.
@@ -39,6 +49,8 @@ To additionally capture output with command substitution: `if ! output=$(mycomma
 
 This also applies to `while`/`until` loops.
 
+The default Solaris 10 Bourne shell does not support negating exit statuses with `!`, so `! mycommand` tries to invoke a utility named "!" instead.  To test for failure, use `if mycommand; then :; else ...; fi` and `until mycommand; do ...; done`.
+ 
 ### Exceptions:
 
-The default Solaris 10 Bourne shell does not support `!` outside of the `test` command (`if ! mycommand; then ...` returns `!: not found`)
\ No newline at end of file
+None.
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