diff --git a/src/crypto/OlmDevice.js b/src/crypto/OlmDevice.js
index 9bc36c2b4..984cbf5d0 100644
--- a/src/crypto/OlmDevice.js
+++ b/src/crypto/OlmDevice.js
@@ -173,7 +173,7 @@ OlmDevice.prototype._getAccount = async function(func) {
     let result;
 
     await this._cryptoStore.endToEndAccountTransaction((accountData, save) => {
-        // Olm has a limited stack size so we must tightly control the number of
+        // Olm has a limited heap size so we must tightly control the number of
         // Olm account objects in existence at any given time: once created, it
         // must be destroyed again before we await.
         const account = new Olm.Account();