diff --git a/src/blobs/build.ts b/src/blobs/build.ts
index 11ff932..5f01f2e 100644
--- a/src/blobs/build.ts
+++ b/src/blobs/build.ts
@@ -53,7 +53,7 @@ export async function generateBuild(
   for (let entry of entries) {
     let ext = path.extname(entry.path)
     let pathParts = entry.path.split('/')
-    let srcPath = `${source}/${entry.srcPath}`
+    let srcPath = entry.diskSrcPath ?? `${source}/${entry.srcPath}`
     let stat = await fs.lstat(srcPath)
 
     if (stat.isSymbolicLink()) {
diff --git a/src/blobs/copy.ts b/src/blobs/copy.ts
index 088b3f3..245b84a 100644
--- a/src/blobs/copy.ts
+++ b/src/blobs/copy.ts
@@ -9,7 +9,7 @@ export async function copyBlobs(entries: Iterable<BlobEntry>, srcDir: string, de
 
   for (let entry of entries) {
     let outPath = `${destDir}/${entry.srcPath}`
-    let srcPath = `${srcDir}/${entry.srcPath}`
+    let srcPath = entry.diskSrcPath ?? `${srcDir}/${entry.srcPath}`
     spinner.text = entry.srcPath
 
     // Symlinks are created at build time, not copied
diff --git a/src/blobs/entry.ts b/src/blobs/entry.ts
index 175b2be..abb05ce 100644
--- a/src/blobs/entry.ts
+++ b/src/blobs/entry.ts
@@ -1,10 +1,19 @@
 import { EXT_PARTITIONS } from '../util/partitions'
 
 export interface BlobEntry {
+  // Android partition
   partition: string
+  // Sub-partition path
   path: string
+  // Combined partition path without "system/"
   srcPath: string
+
+  // Path to copy file from on host (default = srcDir/srcPath)
+  diskSrcPath?: string
+
+  // Whether to keep the original signature (for APKs only)
   isPresigned: boolean
+  // Whether to force creating a named dependency module
   isNamedDependency: boolean
 }