diff --git a/dist/restore/index.js b/dist/restore/index.js
index 7adf64f..05267ef 100644
--- a/dist/restore/index.js
+++ b/dist/restore/index.js
@@ -86767,7 +86767,11 @@ class CacheConfig {
         this.cachePaths = [];
         /** The primary cache key */
         this.cacheKey = "";
-        /** The secondary (restore) key that only contains the prefix and environment */
+        /**
+         *  The secondary (restore) key that only contains the prefix and environment
+         *  This should be used if the primary cacheKey is not available - IE pulling from main on a branch
+         *  instead of the branch itself
+         * */
         this.restoreKey = "";
         /** Whether to cache CARGO_HOME/.bin */
         this.cacheBin = true;
@@ -86946,6 +86950,11 @@ class CacheConfig {
         let lockHash = digest(hasher);
         keyFiles.push(...parsedKeyFiles);
         self.keyFiles = sort_and_uniq(keyFiles);
+        // todo(jon): make sure we differentiate incrementals on different branches
+        // we can use just a single cache per incremental branch
+        if (self.incremental) {
+            key += `-incremental`;
+        }
         key += `-${lockHash}`;
         self.cacheKey = key;
         self.cachePaths = [external_path_default().join(config_CARGO_HOME, "registry"), external_path_default().join(config_CARGO_HOME, "git")];
diff --git a/dist/save/index.js b/dist/save/index.js
index 714a7c6..9fb3841 100644
--- a/dist/save/index.js
+++ b/dist/save/index.js
@@ -86767,7 +86767,11 @@ class CacheConfig {
         this.cachePaths = [];
         /** The primary cache key */
         this.cacheKey = "";
-        /** The secondary (restore) key that only contains the prefix and environment */
+        /**
+         *  The secondary (restore) key that only contains the prefix and environment
+         *  This should be used if the primary cacheKey is not available - IE pulling from main on a branch
+         *  instead of the branch itself
+         * */
         this.restoreKey = "";
         /** Whether to cache CARGO_HOME/.bin */
         this.cacheBin = true;
@@ -86946,6 +86950,11 @@ class CacheConfig {
         let lockHash = digest(hasher);
         keyFiles.push(...parsedKeyFiles);
         self.keyFiles = sort_and_uniq(keyFiles);
+        // todo(jon): make sure we differentiate incrementals on different branches
+        // we can use just a single cache per incremental branch
+        if (self.incremental) {
+            key += `-incremental`;
+        }
         key += `-${lockHash}`;
         self.cacheKey = key;
         self.cachePaths = [external_path_default().join(CARGO_HOME, "registry"), external_path_default().join(CARGO_HOME, "git")];
diff --git a/src/config.ts b/src/config.ts
index 706e6e2..ecae9fb 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -23,7 +23,11 @@ export class CacheConfig {
   public cachePaths: Array<string> = [];
   /** The primary cache key */
   public cacheKey = "";
-  /** The secondary (restore) key that only contains the prefix and environment */
+  /**
+   *  The secondary (restore) key that only contains the prefix and environment
+   *  This should be used if the primary cacheKey is not available - IE pulling from main on a branch
+   *  instead of the branch itself
+   * */
   public restoreKey = "";
 
   /** Whether to cache CARGO_HOME/.bin */
@@ -251,6 +255,8 @@ export class CacheConfig {
     keyFiles.push(...parsedKeyFiles);
     self.keyFiles = sort_and_uniq(keyFiles);
 
+    // todo(jon): make sure we differentiate incrementals on different branches
+    // we can use just a single cache per incremental branch
     if (self.incremental) {
       key += `-incremental`;
     }