diff --git a/science/mathematics/double-conversion/pisi-index.xml b/science/mathematics/double-conversion/pisi-index.xml
new file mode 100644
index 0000000000..d0627317ae
--- /dev/null
+++ b/science/mathematics/double-conversion/pisi-index.xml
@@ -0,0 +1,36 @@
+<PISI>
+    <SpecFile>
+        <Source>
+            <Name>double-conversion</Name>
+            <Homepage>https://github.com/google/double-conversion</Homepage>
+            <Packager>
+                <Name>Ali Cengiz Kurt</Name>
+                <Email>alicengizkurt@gmail.com</Email>
+            </Packager>
+            <License>BSD 3-clause</License>
+            <IsA>app:console</IsA>
+            <PartOf>science.mathematics</PartOf>
+            <Summary xml:lang="en">Binary-decimal and decimal-binary conversion routines</Summary>
+            <Description xml:lang="en">Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles.</Description>
+            <Archive type="targz" sha1sum="d900d4d946beb493a03cd6c9b180ed2bcbd0f20e">https://github.com/google/double-conversion/archive/v3.0.0.tar.gz</Archive>
+            <SourceURI>pspec.xml</SourceURI>
+        </Source>
+        <Package>
+            <Name>double-conversion</Name>
+            <Files>
+                <Path fileType="library">/usr/lib</Path>
+                <Path fileType="data">/usr/include/double-conversion/</Path>
+                <Path fileType="doc">/usr/share/doc</Path>
+            </Files>
+        </Package>
+        <History>
+            <Update release="1">
+                <Date>2018-02-01</Date>
+                <Version>3.0.0</Version>
+                <Comment>First release</Comment>
+                <Name>Ali Cengiz Kurt</Name>
+                <Email>alicengizkurt@gmail.com</Email>
+            </Update>
+        </History>
+    </SpecFile>
+</PISI>
\ No newline at end of file
diff --git a/science/mathematics/double-conversion/pisi-index.xml.sha1sum b/science/mathematics/double-conversion/pisi-index.xml.sha1sum
new file mode 100644
index 0000000000..baa6266680
--- /dev/null
+++ b/science/mathematics/double-conversion/pisi-index.xml.sha1sum
@@ -0,0 +1 @@
+506e3ab9cb9d80f8fb5259e620fbcd80b7449a61
\ No newline at end of file
diff --git a/science/mathematics/double-conversion/pisi-index.xml.xz b/science/mathematics/double-conversion/pisi-index.xml.xz
new file mode 100644
index 0000000000..7e11267686
Binary files /dev/null and b/science/mathematics/double-conversion/pisi-index.xml.xz differ
diff --git a/science/mathematics/double-conversion/pisi-index.xml.xz.sha1sum b/science/mathematics/double-conversion/pisi-index.xml.xz.sha1sum
new file mode 100644
index 0000000000..539f296914
--- /dev/null
+++ b/science/mathematics/double-conversion/pisi-index.xml.xz.sha1sum
@@ -0,0 +1 @@
+ec89bdf5587425b3d7138c78415242f1eadad9ab
\ No newline at end of file
diff --git a/science/mathematics/double-conversion/pspec.xml b/science/mathematics/double-conversion/pspec.xml
index 1883fd212f..699fabb78f 100644
--- a/science/mathematics/double-conversion/pspec.xml
+++ b/science/mathematics/double-conversion/pspec.xml
@@ -1,3 +1,5 @@
+<?xml version="1.0" ?>
+<!DOCTYPE PISI SYSTEM "http://www.pisilinux.org/projeler/pisi/pisi-spec.dtd">
 <PISI>
     <Source>
         <Name>double-conversion</Name>