diff --git a/README.md b/README.md
index c591ba1..c0178a0 100644
--- a/README.md
+++ b/README.md
@@ -17,11 +17,12 @@ The score is the total number of occurrences of `<code></code>` blocks in the ba
 
 
 ### Outputs
-| Output     | Description                                                 |
-|------------|-------------------------------------------------------------|
-| base_score | Baseline score at base_ref                                  |
-| head_score | Baseline score at head_ref                                  |
-| score_diff | Difference between the two scores (head_score - base_score) |
+| Output            | Description                                                     |
+|-------------------|-----------------------------------------------------------------|
+| base_score        | Baseline score at base_ref                                      |
+| head_score        | Baseline score at head_ref                                      |
+| score_diff        | Difference between the two scores (head_score - base_score)     |
+| score_diff_string | 'Same a `score_diff`, with a `+` prepended for positive numbers |
 
 ## Examples
 
diff --git a/action.yml b/action.yml
index e95f9c7..1cad48d 100644
--- a/action.yml
+++ b/action.yml
@@ -23,6 +23,8 @@ outputs:
     description: 'Baseline score for the pull request head'
   score_diff:
     description: 'Difference between the two scores (head_score - base_score)'
+  score_diff_string:
+    description: 'Same as `score_diff`, with a `+` prepended for positive numbers'
 runs:
   using: 'docker'
   image: 'Dockerfile'
diff --git a/entrypoint.sh b/entrypoint.sh
index 3c01793..a46e5cf 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -38,10 +38,12 @@ echo "base_score: $BASE_SCORE"
 
 # Check if scores are different
 SCORE_DIFF=$((HEAD_SCORE - BASE_SCORE))
+SCORE_DIFF_STRING=$(printf '%+d' $SCORE_DIFF)
 
 # Set outputs
 {
   echo "base_score=$BASE_SCORE"
   echo "head_score=$HEAD_SCORE"
   echo "score_diff=$SCORE_DIFF"
+  echo "score_diff_string=$SCORE_DIFF_STRING"
 } >>"$GITHUB_OUTPUT"