diff --git a/.changeset/large-mirrors-cheer.md b/.changeset/large-mirrors-cheer.md
new file mode 100644
index 000000000..4e3903039
--- /dev/null
+++ b/.changeset/large-mirrors-cheer.md
@@ -0,0 +1,5 @@
+---
+'mermaid': patch
+---
+
+fix: Update casing of ID in requirement diagram
diff --git a/packages/mermaid/src/rendering-util/rendering-elements/shapes/requirementBox.ts b/packages/mermaid/src/rendering-util/rendering-elements/shapes/requirementBox.ts
index eb50d09bd..ed764f5ee 100644
--- a/packages/mermaid/src/rendering-util/rendering-elements/shapes/requirementBox.ts
+++ b/packages/mermaid/src/rendering-util/rendering-elements/shapes/requirementBox.ts
@@ -54,7 +54,7 @@ export async function requirementBox<T extends SVGGraphicsElement>(
   if (isRequirementNode) {
     const idHeight = await addText(
       shapeSvg,
-      `${requirementNode.requirementId ? `id: ${requirementNode.requirementId}` : ''}`,
+      `${requirementNode.requirementId ? `ID: ${requirementNode.requirementId}` : ''}`,
       accumulativeHeight,
       node.labelStyle
     );